feat(Change Tracking): add Datasource documentation

content/en/change_tracking/_index.md

@@ -119,6 +119,28 @@
 3. Hover over any change indicator or overlay to view a summary of the change.
 4. Click the change indicator or overlay to view detailed information and take remediation actions.
 
+### Visualize Change Tracking data in widgets
+
+In addition to the out-of-the-box integrations described above, **Change Tracking is available as a data source for widgets** across Datadog, including Dashboards and Notebooks.
+
+To configure a widget using Change Tracking data:
+
+1.	In a dashboard or notebook, add or edit a supported widget type (Timeseries, Query Value, Table, Tree Map, Top List, Pie, Change, or Bar Chart).
+3.	From the **Data source** dropdown, select **Change Tracking**.
+4.	Configure your filters (**Service** is required).
+5.	(Optional) For widgets that support grouping, use **Group by** to split results.
+
+{{< img src="/change_tracking/change-tracking-datasource-widget.png" alt="Change Tracking datasource widgets" style="width:50%;" >}}
+
+For Timeseries widgets, Change Tracking can also be enabled as an **event overlay** from the **Event Overlays** section. This displays changes overlaid on top of a timeseries to help correlate them with metric behavior.
+
+{{< img src="/change_tracking/change-tracking-datasource-overlay.png" alt="Change Tracking datasource as Event Overlay" style="width:50%;" >}}
+
+
+#### View change details
+
+To view information about a change or set of changes, click a datapoint in the widget and select **View Changes**. This opens the Change Tracking side panel with additional details.
+
 ## Tracked changes
 Change Tracking follows these types of changes across your infrastructure: